Grommets are tiny tubes that can be inserted into the eardrums to treat conditions that affect the middle ear, such as recurrent middle ear infections and glue ear.Glue ear, also known as otitis media with effusion, is a persistent build-up of fluid in the middle ear that can cause hearing problems.rommets are tiny tubes that can be inserted into the eardrums to treat conditions that affect the middle ear, such as recurrent middle ear infections and glue ear.
1 On average, UPC code can cost anywhere between $7.95 and $250. 2  GS1 will charge you $250 for 10 unique products with a yearly renewal rate of $50.3  However, in order to receive a UPC code, you will need to pay at least $750 for the initial fee and at least $150 a year to keep your membership active. Membership costs begin at $250 and can be as high as $750 for the initial charges. 2  There is an annual renewal fee starts at $50 up to $150. 3  The fees depend upon the number of unique items you sell. 4  There are lots of barcode hardware and software available.
NOTE: In reality, an UPC-A symbol is an EAN-13 symbol with the first number system digit set to 0. For example, take the UPC-A code 075678164125. This same code, expressed as an EAN-13 symbol, would be 0075678164125.As you can see, we just slapped a leading 0 in front.Compare the original UPC-A symbol (top) to the EAN-13 symbol (bottom): At first glance, the two bar codes look different.NCODING EAN-13 (AND UPC-A) The encoding for EAN-13 (and UPC-A) bar codes is relatively straight-forward. To encode a value as an EAN-13 bar code, the checksum digit must first be calculated and the entire bar code, including check digit, may then be encoded as a sequence of bars and spaces.